BUZZER

INSTRUCTION SHEET

 

 

 

Price - Stock No 10

1. Check and identify the components in the Kit:

Schematic Diagram

2. Check the circuit diagram. Notice that:

  1. The switch opens and closes the circuit.
  2. The electronic buzzer is polarised (PIEZO BUZZER) The positive lead (RED) must be connected to the positive battery terminal (red wire on the battery snap) Try connecting it the other way round (red to black wires). Can you explain why it doesn't make a sound? Can you find out and explain what is the peculiarthing about semi-conductors?
  3. Solder the red wire of the battery snap to one pole of the switch - not too much heat; the switch is made of plastic.
  4. Solder the red wire of the buzzer to the other switch terminal.
  5. Slide the heatshrink tube onto one of the black leads.
  6. Join the black lead ends and solder them together.
  7. Slide the heatshrink tube over the joint and apply enough heat to shrink the tube over the joint. This acts as an insulator. The heatshrink is made of P.V.C - a thermoplastic material. Find out about its "memory" and see if you can work out how heatshrink is made.
  8. Connect a 9V battery and test your project by pressing the button. If it doesn't work check your soldering and the polarity - red leads connected to red, black to black.
  9. Measure the size of the switch thread and drill the correct size hole to mount the switch.
  10. Drill a small hole for the screw and fasten the battery tamer in a suitable place.  If you want, the switch may be mounted right away from the buzzer unit and/or the battery; eg - you might mount the switch at your door and the battery and buzzer somewhere in your room where it may be heard easily. Run two hook-up wires from the switch to the buzzer unit and the battery snap. Light hook-up wire or figure 8 speaker wire are fine. Remember the switch MUST be placed in SERIES in the circuit. Its function is to open and close the circuit. Make sure you hook it up correctly according to the Circuit Diagram.

Quick Test

Which materials are insulators? Choose your answer and circle it.
WOOD                Yes ........No
COPPER              Yes ........No
ALUMINIUM      Yes ........No
RUBBER              Yes ........No
CERAMICS         Yes ........No

 

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